Photographing impacts with a remote trigger circuit - Creative Uses of CHDK - CHDK Forum
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Photographing impacts with a remote trigger circuit

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Offline mikeworth

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Photographing impacts with a remote trigger circuit
« on: 31 / May / 2012, 08:22:34 »
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I want to photograph some destructive impacts by using a remote trigger. I've rigged up a hammer on the end of a pendulum and an infrared detector circuit that can sense when the hammer has reached the bottom of its swing just before the impact, however there seems to be too much of a delay between 5V being applied to the USB line and the photograph being taken.

I've tried using the script from here but still no luck. Is there a way of doing this at a lower level such that I manually configure everything before hand then wait for a positive edge on the USB line then open the shutter?

Thanks,
Mike
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Offline waterwingz

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Re: Photographing impacts with a remote trigger circuit
« Reply #1 on: 31 / May / 2012, 09:03:16 »
Quote from: mikeworth on 31 / May / 2012, 08:22:34
I've tried using the script from here but still no luck. Is there a way of doing this at a lower level such that I manually configure everything before hand then wait for a positive edge on the USB line then open the shutter?
You probably want to experiment with the "sync" functionality of the USB remote code.  It basically starts the shooting process when 5V is applied to the USB port but holds off the actual release of the shutter until the 5V goes away at the last possible millisecond in the code.

The USB remote functionality in the new development version of CHDK is a lot easier to setup and use - you will probably find the stuff in the stable version confusing. 

There has been some recent concern that the sync in newer cameras is slower and less reliable.  Its not clear to me if that is true or if its more the case that nobody has gone deeper into the code to find the last possible moment to release the shutter (rather than just relying on the hack that what was done four or five years ago).

Let us know what you find out ?

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